Spark-arrester.



PATBNTBD sBPT.15,19osl F. E. ROGERS a. E. HosKING.

SPARK ARRESTER.

APrLIoATIoN FILED AUG. 4. 1902.

N0 MODEL.

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Nima4 Srrrrns v Patented september 15,1903.

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FRANCIS EDWARD ROGERS AND EBENEZER HOSKING, OF MOUNT GAMBIER., SOUTHAUSTRALIA, AUSTRALIA.

SPARK-ARRESTER.

SPECIFICATION forming part of Letters PatentNo. 739,225, dated September15, 1903.

Application filed August 4, 1902.

To all Loh/m t may concern:

Be it known that we, FRANCIS EDWARD l ROGERS and EBENEZER HOSKING,iron-workers, subjects of the King of Great Britain and Ireland, andresidents of Commercial street, Mount Gambier, in the State of SouthAustralia, Commonwealth of Australia, have invented a-certain new anduseful Spark-Arrester, of which the following is a specification.

The essential feature of the invention consists in the affixture of arotatable screen within or below the funnel of a locomotive or otherfurnace and so situated and arranged as to be acted upon by theexhaust-current or by other power, such as a supplementary steamjet. Thescreen may be of size and shape according to requirement of theparticular funnel and furnace; but it is always of such shape andproportions that nothing can pass between its edges and the funnel, thewhole of the steam and gaseous products of combustion passing throughthe leaves' of the screen and the sparks being deflected backintothesmoke-box. Thescreen maybeeither immediately within thev base ofthe funnel or it may be placed slightly nearer the boiler. If within thefunnel, the screen is of such size as to approximately fill the opening.When placed nearer the boiler, the screen is of larger size and sosituated that the leaves in rotatjas ing approximately cover the openingof the funnel. In the latter case the funnel may be slightly widened a'tthe bottom to afford room for the screen. v

In order that our invention maybe clearly understood, we will describethe same, with `reference to the accompanying drawings, in

four semicircular frames A, attached to a cen- Serial No. 118,261. (Nomodel.)

or the space between each frame and the spin- 6c dle is filled by wovenwire D of suitable mesh or a perforated plate. -'Tl1e outer edge ofthe`woven wire is secured to the semicircular frame by clamps or rivets,while-its edges at the center are all bound together andv to the centralspindle by a wire laceorin other convenieut manner. The outer' edge of`each framehas a lip E projecting at slightly lessl than a right anglefrom the leaf. This may be produced by a suitable form of angle-iron 7oor by a separate plate riveted thereto., This y return-lip will projectbackward fromthe leaf when in operation. In the screen shown in Figs. 6and 7 the angle-iron frames are of semi-oval form; but

otherwise the construction is the same. The spindle of the screen issupported horizontally by bearings H, one at eachv end, which areprovided at any convenient position on' the smoke-box or funnel andeither inside or 8o outside.

The exhaust or steam-jet pipe must be so situated or formed that thesteam is directed toward one side of the screen, thereby causing it torotate in the direction shown by the v arrows in Figs. 4 and 6. Inoperation when the 'exhaust or the operating steam-jet strikes againstthe leaf of the screen it turns it in the direction indicated and,striking the successive leaves, 9o l.causes the screen to revolverapidly. The

result is that the sparkscannot pass `the rapidly-revolving screen,becauseas they strike the leaves and the 'downwardly-projecting lipsthey are broken and thrown off the screen into the smoke-box andeectually prevented from entering the funnel.

It will be seen that there is no fixed screen or other obstruction tobecome choked, and

thereby impede the current; but the axially- ',loo

arranged screen being driven at a rapid rate the sparks are intercepted,broken up, and

Each semicircular frame 55- thrown off the screen back into thesmokebox, while the steam and gaseous products of combustion pass through the leaves, and there is no reduction in the power and eectiveness of the draft.

Having now particularly described and ascertained the nature of oursaidinvention and in what manner the same is to be performed, we declarethat what we claim is- A spark-arrester, comprising a smoke-box providedwith a cylindrical smoke-stack, an exhaust-nozzle mounted within saidsmokebox and free to discharge into said smokestack, a revoluble memberprovided with substantially semicircular screens radially mountedthereupon, said revoluble member being so disposed that said screens arefree to successively obstruct the path of discharge

